GB1293771A - Improvements relating to exposure control systems for photographic apparatus - Google Patents

Improvements relating to exposure control systems for photographic apparatus

Info

Publication number
GB1293771A
GB1293771A GB61238/69A GB6123869A GB1293771A GB 1293771 A GB1293771 A GB 1293771A GB 61238/69 A GB61238/69 A GB 61238/69A GB 6123869 A GB6123869 A GB 6123869A GB 1293771 A GB1293771 A GB 1293771A
Authority
GB
United Kingdom
Prior art keywords
amplifier
output
impedance
cell
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB61238/69A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polaroid Corp
Original Assignee
Polaroid Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polaroid Corp filed Critical Polaroid Corp
Publication of GB1293771A publication Critical patent/GB1293771A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/34—Dc amplifiers in which all stages are dc-coupled
    • H03F3/343—Dc amplifiers in which all stages are dc-coupled with semiconductor devices only
    • H03F3/347—Dc amplifiers in which all stages are dc-coupled with semiconductor devices only in integrated circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4214—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for view-taking apparatus
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G03B7/087—Analogue circuits for control of both exposure time and aperture
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/70—Charge amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Exposure Control For Cameras (AREA)
  • Amplifiers (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
GB61238/69A 1968-12-16 1969-12-16 Improvements relating to exposure control systems for photographic apparatus Expired GB1293771A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78385568A 1968-12-16 1968-12-16

Publications (1)

Publication Number Publication Date
GB1293771A true GB1293771A (en) 1972-10-25

Family

ID=25130608

Family Applications (1)

Application Number Title Priority Date Filing Date
GB61238/69A Expired GB1293771A (en) 1968-12-16 1969-12-16 Improvements relating to exposure control systems for photographic apparatus

Country Status (7)

Country Link
US (1) US3620143A (fr)
JP (1) JPS4915821B1 (fr)
CA (1) CA928557A (fr)
DE (1) DE1963085C3 (fr)
FR (1) FR2026257A1 (fr)
GB (1) GB1293771A (fr)
NL (1) NL169232C (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3626825A (en) * 1970-05-28 1971-12-14 Texas Instruments Inc Radiation-sensitive camera shutter and aperture control systems
US3734632A (en) * 1970-10-31 1973-05-22 Minolta Camera Kk Current compensated detection circuits for photovoltaic cells
US3758796A (en) * 1971-06-10 1973-09-11 Texas Instruments Inc Photosensor control
US3849786A (en) * 1971-12-10 1974-11-19 Minolta Camera Kk Light integrating type light detector circuit with photovoltaic cell
DE2255329C3 (de) * 1972-11-11 1977-11-17 Kodak Ag Photographischer blendenverschluss
US3809992A (en) * 1972-11-13 1974-05-07 Mamiya Camera Circuit for storing a representation of an incident light quantity in a camera
JPS5521326B2 (fr) * 1972-11-16 1980-06-09
JPS5842415B2 (ja) * 1974-03-08 1983-09-20 ミノルタ株式会社 カメラノロシユツジヨウホウエンザンカイロ
US4129371A (en) * 1977-09-02 1978-12-12 Polaroid Corporation Electromagnet controlled scanning shutter blade arrangement
JPS5415736A (en) * 1978-06-14 1979-02-05 Yashica Co Ltd Photocurrent amplifing circuit
JPS5481785U (fr) * 1978-08-23 1979-06-09
US4241280A (en) * 1979-06-25 1980-12-23 Polaroid Corporation Light integrator circuit with built-in anticipation
US4255030A (en) * 1979-09-13 1981-03-10 Polaroid Corporation Camera with proportional fill flash quench strobe
US4346971A (en) * 1979-10-01 1982-08-31 Polaroid Corporation Photographic apparatus with controlled shutter blade time out
US4290683A (en) * 1980-09-22 1981-09-22 Polaroid Corporation Sonar responsive shutter blade time out control circuit
US4293208A (en) * 1980-10-20 1981-10-06 Polaroid Corporation Prebias for digital light integrator
US4306786A (en) * 1980-12-19 1981-12-22 Polaroid Corporation Photographic exposure control with scene light integration level determined as function of pre-exposure ambient scene light detect
US4355873A (en) * 1981-06-08 1982-10-26 Polaroid Corporation Photographic control system for varying both flash fire aperture and exposure termination in correspondence with film speed
US4717935A (en) * 1985-08-09 1988-01-05 Polaroid Corporation Electronic trim control for dual-photodetector exposure control system
US4876566A (en) * 1988-10-17 1989-10-24 Polaroid Corporation Camera having auto-trim exposure control

Also Published As

Publication number Publication date
NL169232B (nl) 1982-01-18
DE1963085B2 (de) 1979-01-25
DE1963085A1 (de) 1970-07-02
DE1963085C3 (de) 1979-09-27
CA928557A (en) 1973-06-19
NL6918855A (fr) 1970-06-18
NL169232C (nl) 1982-06-16
JPS4915821B1 (fr) 1974-04-17
US3620143A (en) 1971-11-16
FR2026257A1 (fr) 1970-09-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee